Installation and construction method of large-diameter pile foundation steel casing at inclined rock section of deep reservoir area

Abstract

The invention discloses an installation and construction method for a large-diameter pile foundation steel casing in an oblique rock section of a deepwater reservoir area. The installation and construction method comprises the following steps: a steel casing machining stage, detection and acceptance of a steel casing steel plate, beveling treatment on the steel casing by adopting a plasma cutting technology, machining of the oblique rock section steel casing, primary rolling of the steel plate by adopting a plate rolling machine, and secondary rolling of the steel plate by adopting a plate rolling machine. Then a second steel casing is in butt joint, a seam is subjected to spot welding fixation, a steel plate is subjected to secondary rolling through a plate rolling machine, and a reinforcing hoop is additionally arranged on the first steel casing; according to the installation and construction method for the large-diameter pile foundation steel casing at the inclined rock section of the deepwater reservoir area, the automatic telescopic guide frame is used for lowering the large-diameter pile foundation steel casing, and the perpendicularity and the center point position of the steel casing are controlled through eight automatic telescopic devices arranged on the upper layer and the lower layer of the guide frame; the method has the advantages of high construction efficiency, high operability, high safety, high adjustability and the like, and solves the problems that the large-diameter steel casing in the inclined rock section is poor in descending and mounting perpendicularity, easy to deviate and the like.

Description

Technical Field

[0001] The present application relates to the technical field of pile foundation steel casing installation, and in particular to a large-diameter pile foundation steel casing installation construction method in an inclined rock section of a deep-water reservoir area. Background Art

[0002] With the acceleration of large-scale bridge construction in my country, the demand for underwater steel casing construction is indeed increasing. Underwater steel casing construction usually involves bridges, docks, tunnels and other projects. Its main function is to form a temporary closed space underwater to provide dry working conditions for pile foundation construction, foundation excavation, pile foundation drilling and other construction. At the same time, it also protects the construction site and ensures construction safety and quality.

[0003] 1. However, during the installation and lowering construction phase of large-diameter steel casing with a length of more than 45 meters in the inclined rock section, it is very easy to have problems such as steel casing misalignment, poor verticality, and low construction efficiency, which directly affect the quality of pile foundation construction. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, one purpose of the present application is to provide a large-diameter pile foundation steel casing installation construction method in the inclined rock section of a deep-water reservoir area, adopt plasma cutting technology to open the groove of the steel casing, enhance the strength and quality of the steel casing assembly welding, solve the problem of leakage caused by loose assembly and welding of the steel casing, add a 30cm high reinforcing hoop at the bottom of the steel casing to enhance the structural strength of the top of the steel casing, solve the problem of easy curling and deformation of the steel casing in the inclined rock area, develop a large-diameter pile foundation steel casing docking and positioning device, solve the problem of slow docking efficiency and poor verticality of the steel casing; and the steel casing docking adopts open groove welding to enhance the docking welding strength and improve the airtightness of the casing, adopt a large-diameter pile foundation steel casing lowering automatic telescopic guide frame, and control the verticality and center point of the steel casing through 8 automatic telescopic devices on the upper and lower layers of the guide frame, which has the advantages of high construction efficiency, high operability, high safety, high adjustability, etc., and solves the problems of poor verticality and easy deviation of the large-diameter steel casing lowering installation in the inclined rock section.

[0006] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a method for installing a large-diameter pile foundation steel casing in a sloping rock section in a deep-water reservoir area. The method for installing a large-diameter pile foundation steel casing in a sloping rock section in a deep-water reservoir area comprises the following steps:

[0007] Step 1: Steel casing processing stage;

[0008] 1. Inspection and acceptance of steel casing steel plates;

[0009] 2. Use plasma cutting technology to bevel the steel casing and process the steel casing in the inclined rock section;

[0010] 3. Use a plate rolling machine to roll the steel plate for the first time, then connect it to the second steel casing and fix the seam by spot welding;

[0011] 4. Use a plate rolling machine to roll the steel plate twice, add a reinforcing hoop to the first section of the steel casing to ensure that the steel casing is round before fully welding the groove;

[0012] 5. Assemble the steel casing to form a group of steel casings and set up internal supports for storage.

[0013] Step 2: Steel casing lowering stage.

[0014] 1. Construction preparation: measurement and layout of the lowering and centering guide frame of the double-layer steel casing;

[0015] 2. Make sure the center line of the guide frame is aligned with the hole of the pile foundation, and install the double-layer centering positioning guide frame;

[0016] 3. Lower the first set of steel casing;

[0017] 4. The second set of steel casing at the bottom;

[0018] 5. During the assembly of the steel casing, an innovatively developed large-diameter pile foundation steel casing docking and positioning device is used to adjust and center the steel casing, and full welding is performed after centering;

[0019] 6. Finally, assemble, fully weld and lower the steel casing in sequence until it is lowered to the predetermined position.

[0020] Step 3: Steel casing installation stage;

[0021] A pile driver is used to drive the steel casing into the foundation along the depth and direction required by the design, ensuring the verticality and positioning accuracy of the pile.

[0022] According to the large-diameter pile foundation steel casing installation construction method in the inclined rock section of a deep-water reservoir area according to the embodiment of the present application, plasma cutting technology is used to perform beveling treatment on the steel casing, thereby enhancing the strength and quality of the steel casing assembly welding, solving the problem of slurry leakage caused by loose assembly and welding of the steel casing, adding a 30 cm high reinforcing hoop at the bottom of the steel casing to enhance the structural strength of the top of the steel casing, solving the problem of easy curling and deformation of the steel casing in the inclined rock area, developing a large-diameter pile foundation steel casing docking and positioning device, solving the problems of slow docking efficiency and poor verticality of the steel casing, and the steel casing docking adopts beveling welding to enhance the docking welding strength and improve the casing airtightness, and adopts an automatic telescopic guide frame for lowering the large-diameter pile foundation steel casing, and the verticality and center point of the steel casing are controlled by 8 automatic telescopic devices on the upper and lower layers of the guide frame, which has the advantages of high construction efficiency, high operability, high safety, high adjustability, etc., solving the problems of poor verticality and easy deviation of the large-diameter steel casing in the inclined rock section.

[0023] In addition, the large-diameter pile foundation steel casing installation construction method for the deep-water reservoir inclined rock section proposed in the present application may also have the following additional technical features:

[0024] The installation construction method of large diameter pile foundation steel casing in the inclined rock section of deep water reservoir area includes the following steps:

[0025] Step 1: Steel casing processing stage;

[0026] 1. Inspection and acceptance of steel casing steel plates;

[0027] 2. Use plasma cutting technology to bevel the steel casing and process the steel casing in the inclined rock section;

[0028] 3. Use a plate rolling machine to roll the steel plate for the first time, then connect it to the second steel casing and fix the seam by spot welding;

[0029] 4. Use a plate rolling machine to roll the steel plate twice, add a reinforcing hoop to the first section of the steel casing to ensure that the steel casing is round before fully welding the groove;

[0030] 5. Assemble the steel casing to form a group of steel casings and set up internal supports for storage.

[0031] Step 2: Steel casing lowering stage.

[0032] 1. Construction preparation: measurement and layout of the lowering and centering guide frame of the double-layer steel casing;

[0033] 2. Make sure the center line of the guide frame is aligned with the hole of the pile foundation, and install the double-layer centering positioning guide frame;

[0034] 3. Lower the first set of steel casing;

[0035] 4. The second set of steel casing at the bottom;

[0036] 5. During the assembly of the steel casing, an innovatively developed large-diameter pile foundation steel casing docking and positioning device is used to adjust and center the steel casing, and full welding is performed after centering;

[0037] 6. Finally, assemble, fully weld and lower the steel casing in sequence until it is lowered to the predetermined position.

[0038] Step 3: Steel casing installation stage;

[0039] A pile driver is used to drive the steel casing into the foundation along the depth and direction required by the design, ensuring the verticality and positioning accuracy of the pile.

[0040] In one embodiment of the present application, the specific method of inspection and acceptance of the steel casing steel plate in step 1.1 is:

[0041] 1.1.1: Appearance inspection: Perform appearance inspection on the surface of the steel plate, including checking whether there are obvious cracks, dents, oxidation and other defects, and whether the surface is flat and clean.

[0042] 1.1.2: Dimension inspection: Measure the thickness, length and width of the steel plate to ensure that it meets the design requirements.

[0043] 1.1.3: Chemical composition analysis: Through sampling and analysis, the chemical composition of the steel plate, including the main alloy elements and impurity content, is tested to ensure that it meets the design standards.

[0044] 1.1.4: Mechanical performance test: Conduct tensile test, impact test and other mechanical performance tests to verify whether the strength, toughness and other performance indicators of the steel plate meet the requirements.

[0045] 1.1.5: Weld inspection: Perform flaw detection, ultrasonic or radiographic inspection on the welded parts to ensure that the weld quality meets the relevant standards.

[0046] 1.1.6: Hardness test: Conduct hardness test on steel plate to verify whether its hardness meets the design requirements.

[0047] 1.1.7: Acceptance documents: Check the relevant acceptance documents of steel casing steel plate, including factory certificate, warranty, etc., to ensure its compliance.

[0048] In one embodiment of the present application, the specific method of beveling the steel plate in step 1.2 is:

[0049] 1.2.1: Determine the opening location and size, and clean the opening area to ensure the surface is clean.

[0050] 1.2.2: Measurement and marking: According to the design requirements, measure and mark the end of the steel casing to determine the position, length and angle of the groove.

[0051] 1.2.3: Cutting: Use appropriate cutting equipment (such as oxyacetylene cutting, plasma cutting, etc.) to cut the end of the steel casing according to the marking to form the required groove shape.

[0052] 1.2.4: Bevel shaping: According to the design requirements, the bevel after cutting shall be shaped and trimmed to ensure that the surface of the bevel is smooth without cracks or other defects.

[0053] 1.2.5: Acceptance: Acceptance of the steel casing after beveling to ensure that the beveling processing meets the design requirements and relevant standards.

[0054] In one embodiment of the present application, the specific method of rounding the steel plate in steps 1.3 and 1.4 is as follows:

[0055] Initial rolling:

[0056] 1.3.1: Place the steel plate on the rounding machine and use the rounding machine to round the steel plate according to the parameter settings to form the required round shape.

[0057] 1.3.2: Rolling adjustment: Adjust the rolled steel casing according to the actual situation to ensure that its roundness and size meet the design requirements;

[0058] 1.3.3: Rolling adjustment: Adjust the rolled steel casing according to the actual situation to ensure that its roundness and size meet the design requirements;

[0059] 1.3.4: Joint treatment: The steel casing after rounding is welded by using carbon dioxide gas shielded welding to make the steel casing form a whole;

[0060] Secondary rolling:

[0061] 1.4.1: After the seam welding is completed, the rounding machine is used for secondary rounding to reduce the thermal deformation of the steel casing during the welding process, ensure the smoothness of the weld, and achieve the complete arc of the steel casing.

[0062] 1.4.2: The first section of steel casing installation reinforcement hoop: In order to solve the problem of curling and deviation during the installation of steel casing in the inclined rock section, a 30cm reinforcement hoop is added to the bottom of the steel casing to enhance the strength of the steel casing at the contact surface between the steel casing and the riverbed.

[0063] 1.4.3: Set up internal support: Use a M-shaped internal support system to provide fixed support inside the steel casing to prevent the steel casing from deformation during storage.

[0064] 1.4.4: Acceptance: Acceptance of the steel casing after rounding shall be carried out to ensure that the rounding process meets the design requirements and relevant standards.

[0065] In one embodiment of the present application, the specific method of assembling the steel casing in step 1.5 is:

[0066] Each set of steel casings is composed of 6 pieces of steel casings assembled and welded, and the length of a set of steel casings is 10.8m. After the steel casings are assembled and welded, they are hoisted and stored with internal supports. The storage days cannot exceed the design requirements to reduce the deformation of the steel casings caused by long-term storage.

[0067] In one embodiment of the present application, the specific method of installing the guide frame in step 2.1 is:

[0068] 2.1.1: Install the guide frame: First, place the guide frame in the predetermined position to ensure that the position of the guide frame is accurate. The installation of the guide frame should meet the design requirements to ensure that it is stable and reliable;

[0069] 2.1.2: Fixing the guide frame: After installing the guide frame, it needs to be fixed. The guide frame is firmly fixed to the steel trestle by welding to ensure that it will not loosen or shift during the subsequent construction process;

[0070] 2.1.3: Fixing the guide frame: After installing the guide frame, it needs to be fixed. The guide frame is firmly fixed to the steel trestle by welding to ensure that it will not loosen or shift during the subsequent construction process;

[0071] 2.1.4: Install the adjustment device: According to the design requirements, it is necessary to install the adjustment device on the guide frame so as to adjust and control the position of the steel casing in the subsequent construction;

[0072] 2.1.5: Acceptance: After the guide frame is installed, acceptance work is required to ensure that the installation of the guide frame complies with relevant technical standards and design requirements and to ensure its quality and stability.

[0073] In one embodiment of the present application, the specific method of lowering the steel casing in step 2.1 is:

[0074] 1. The steel casing is lowered by a crawler crane. First, four lifting ports of the same elevation are opened at the top of the steel casing, and then a shoulder pole beam is used for lifting;

[0075] 2. After the steel casing is implanted and positioned, immediately weld the corbels on the steel casing to fix it, then assemble and weld the next section of the steel casing, and measure and check the verticality.

[0076] In one embodiment of the present application, the specific method of laying the steel casing in step 3 is as follows:

[0077] 1. Set up monitoring points in two mutually perpendicular directions, direct the crane to operate, make the steel casing naturally vertically aligned with the pile position, start the vibrator; at the same time, slightly relax the crane hook, and control the hook's descending speed so that the casing can be sunk into the soil while maintaining a vertical state. Continuously observe the verticality of the steel casing at two observation points, and immediately adjust the hook position to correct any tilting tendency.

[0078] 2. Crawler crane cooperates with vibratory hammer to sink steel casing. When vibratory hammer vibrates into steel casing, it first uses deadweight to sink. After ensuring the accurate position of steel casing and sufficient stability of pile body, it uses vibration to sink.

[0079] 3. During the vibration process, the vibrating hammer, pile clamp, etc. must be reliably connected, and their center should be kept in a straight line with the center of the casing and the center of the bored pile as much as possible.

[0080] 4. After the casing is planted, it is necessary to carefully and accurately measure the casing and make detailed adjustments based on the measurement results. During the measurement, points can be set on the platform at the same time to facilitate the measurement of intersections. The position and elevation of the casing can be controlled by measurement during the insertion process.

[0081] In one embodiment of the present application, the specific method of the construction preparation in step 2.1 is:

[0082] 1. Before starting construction, review the construction drawings based on the engineering geological data and hydrogeological data provided by the design drilling, and then conduct detailed safety and technical briefings for on-site management personnel and construction personnel.

[0083] 2. Investigate the construction site environment and the natural environment, underwater conditions, dangerous buildings, etc. in the adjacent areas.

[0084] 3. Check and verify the technical performance and related information of the main construction machinery and its supporting equipment to ensure safety and continuity during the construction process.

[0085] 4. Arrange the construction site reasonably according to the design drawings, do a good job of pile foundation hole protection and remove debris. After site preparation, organize surveying and setting out personnel to lay out all pile positions, nail cross protection piles, do a good job of measurement review, and record the setting out data for filing.

[0086] In one embodiment of the present application, the specific method of processing the steel casing in the inclined rock section in step 1.2 is:

[0087] In order to solve the problem of easy displacement and slippage of steel casing in inclined rock sections, customized steel casing with the same slope as the riverbed is adopted. According to geological exploration and design drawings, the slope of the riverbed at the pile foundation position is determined, and then the steel casing is cut with inscribed lines to ensure that the bottom slope of the steel casing is consistent with the slope of the riverbed.

[0088] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0090] Figure 1 The present invention is a process flow chart of a method for installing a large-diameter pile foundation steel casing in an inclined rock section of a deep-water reservoir according to an embodiment of the present application. DETAILED DESCRIPTION

[0091] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0092] The following describes the installation construction method of a large-diameter pile foundation steel casing in an inclined rock section of a deep-water reservoir area according to an embodiment of the present application in conjunction with the accompanying drawings.

[0093] The pile foundation steel casing installation provided in the embodiment of the present application can be applied to underwater pile foundation construction, soft soil foundation, special geological conditions, construction that requires protection of the surrounding environment, large-scale foundation projects, etc.

[0094] like Figure 1 As shown, the large-diameter pile foundation steel casing installation construction method in the deep-water reservoir inclined rock section of the embodiment of the present application includes the following steps:

[0095] Step 1: Steel casing processing stage;

[0096] 1. Inspection and acceptance of steel casing steel plates;

[0097] 2. Use plasma cutting technology to bevel the steel casing and process the steel casing in the inclined rock section;

[0098] 3. Use a plate rolling machine to roll the steel plate for the first time, then connect it to the second steel casing and fix the seam by spot welding;

[0099] 4. Use a plate rolling machine to roll the steel plate twice, add a reinforcing hoop to the first section of the steel casing to ensure that the steel casing is round before fully welding the groove;

[0100] 5. Assemble the steel casing to form a group of steel casings and set up internal supports for storage.

[0101] Step 2: Steel casing lowering stage.

[0102] 1. Construction preparation: measurement and layout of the lowering and centering guide frame of the double-layer steel casing;

[0103] 2. Make sure the center line of the guide frame is aligned with the hole of the pile foundation, and install the double-layer centering positioning guide frame;

[0104] 3. Lower the first set of steel casing;

[0105] 4. The second set of steel casing at the bottom;

[0106] 5. During the assembly of the steel casing, an innovatively developed large-diameter pile foundation steel casing docking and positioning device is used to adjust and center the steel casing, and full welding is performed after centering;

[0107] 6. Finally, assemble, fully weld and lower the steel casing in sequence until it is lowered to the predetermined position.

[0108] Step 3: Steel casing installation stage;

[0109] A pile driver is used to drive the steel casing into the foundation along the depth and direction required by the design, ensuring the verticality and positioning accuracy of the pile.

[0110] Specifically, plasma cutting technology is used to bevel the steel casing, which enhances the strength and quality of the steel casing assembly and welding, and solves the problem of leakage caused by loose steel casing assembly and welding. A 30 cm high reinforcing hoop is added to the bottom of the steel casing to enhance the structural strength of the top of the steel casing, which solves the problem of easy curling and deformation of the steel casing in the inclined rock area. A large-diameter pile foundation steel casing docking and positioning device is developed to solve the problems of slow steel casing docking efficiency and poor verticality. The steel casing docking adopts bevel welding to enhance the docking welding strength and improve the airtightness of the casing. An automatic telescopic guide frame for lowering large-diameter pile foundation steel casing is adopted. The verticality and center point of the steel casing are controlled by 8 automatic telescopic devices on the upper and lower layers of the guide frame. It has the advantages of high construction efficiency, high operability, high safety and high adjustability, and solves the problems of poor verticality and easy deviation of the lowering and installation of large-diameter steel casing in the inclined rock section.

[0111] Furthermore, the above-mentioned large-diameter pile foundation steel casing installation construction method in the inclined rock section of the deep-water reservoir area also includes:

[0112] In the embodiments of this application.

[0113] In the embodiment of the present application, the specific method of inspection and acceptance of the steel casing steel plate in step 1.1 is:

[0114] 1.1.1: Appearance inspection: Perform appearance inspection on the surface of the steel plate, including checking whether there are obvious cracks, dents, oxidation and other defects, and whether the surface is flat and clean.

[0115] 1.1.2: Dimension inspection: Measure the thickness, length and width of the steel plate to ensure that it meets the design requirements.

[0116] 1.1.3: Chemical composition analysis: Through sampling and analysis, the chemical composition of the steel plate, including the main alloy elements and impurity content, is tested to ensure that it meets the design standards.

[0117] 1.1.4: Mechanical performance test: Conduct tensile test, impact test and other mechanical performance tests to verify whether the strength, toughness and other performance indicators of the steel plate meet the requirements.

[0118] 1.1.5: Weld inspection: Perform flaw detection, ultrasonic or radiographic inspection on the welded parts to ensure that the weld quality meets the relevant standards.

[0119] 1.1.6: Hardness test: Conduct hardness test on steel plate to verify whether its hardness meets the design requirements.

[0120] 1.1.7: Acceptance documents: Check the relevant acceptance documents of steel casing steel plate, including factory certificate, warranty, etc., to ensure its compliance.

[0121] Inspection and acceptance of steel casing steel plates is an important step to ensure that the quality of steel casing meets the design requirements and construction standards. This project uses Q235 steel with a wall thickness of ≥10mm and a single steel plate width of 1.8m;

[0122] Material quality control: Inspect the quality and size of the steel casing materials, including the chemical composition and mechanical properties of the materials, to ensure compliance with relevant standards and specifications.

[0123] In this embodiment, the specific method of beveling the steel plate in step 1.2 is:

[0124] 1.2.1: Determine the opening location and size, and clean the opening area to ensure the surface is clean.

[0125] 1.2.2: Measurement and marking: According to the design requirements, measure and mark the end of the steel casing to determine the position, length and angle of the groove.

[0126] 1.2.3: Cutting: Use appropriate cutting equipment (such as oxyacetylene cutting, plasma cutting, etc.) to cut the end of the steel casing according to the marking to form the required groove shape.

[0127] 1.2.4: Bevel shaping: According to the design requirements, the bevel after cutting shall be shaped and trimmed to ensure that the surface of the bevel is smooth without cracks or other defects.

[0128] 1.2.5: Acceptance: Acceptance of the steel casing after beveling to ensure that the beveling processing meets the design requirements and relevant standards.

[0129] Processing quality control: Control the processing technology of steel casing, including the detection of processing quality indicators such as pipe wall thickness, diameter, roundness, beveling, etc., to ensure that the processing meets the design requirements.

[0130] In pile foundation engineering, in order to connect the steel casing, it is necessary to open the end of the steel casing. This treatment can ensure that the connection between the steel casings is firm and reliable and prevent the occurrence of slurry leakage.

[0131] In this embodiment, the specific method of rolling the steel plate in steps 1.3 and 1.4 is as follows:

[0132] Initial rolling:

[0133] 1.3.1: Place the steel plate on the rounding machine and use the rounding machine to round the steel plate according to the parameter settings to form the required round shape.

[0134] 1.3.2: Rolling adjustment: Adjust the rolled steel casing according to the actual situation to ensure that its roundness and size meet the design requirements;

[0135] 1.3.3: Rolling adjustment: Adjust the rolled steel casing according to the actual situation to ensure that its roundness and size meet the design requirements;

[0136] 1.3.4: Joint treatment: The steel casing after rounding is welded by using carbon dioxide gas shielded welding to make the steel casing form a whole;

[0137] Secondary rolling:

[0138] 1.4.1: After the seam welding is completed, the rounding machine is used for secondary rounding to reduce the thermal deformation of the steel casing during the welding process, ensure the smoothness of the weld, and achieve the complete arc of the steel casing.

[0139] 1.4.2: The first section of steel casing installation reinforcement hoop: In order to solve the problem of curling and deviation during the installation of steel casing in the inclined rock section, a 30cm reinforcement hoop is added to the bottom of the steel casing to enhance the strength of the steel casing at the contact surface between the steel casing and the riverbed.

[0140] 1.4.3: Set up internal support: Use a M-shaped internal support system to provide fixed support inside the steel casing to prevent the steel casing from deformation during storage.

[0141] 1.4.4: Acceptance: Acceptance of the steel casing after rounding shall be carried out to ensure that the rounding process meets the design requirements and relevant standards.

[0142] The rounding effect of steel casing directly affects the quality of pile punching in the later stage. The steel casing rounding process plays an important role in pile foundation engineering. It ensures the stability, safety and reliability of the project by improving the bearing capacity, improving the construction quality, reducing stress concentration, improving the connection quality and meeting the design requirements.

[0143] In this embodiment, the specific method of assembling the steel casing in step 1.5 is:

[0144] Each set of steel casings is composed of 6 pieces of steel casings assembled and welded, and the length of a set of steel casings is 10.8m. After the steel casings are assembled and welded, they are hoisted and stored with internal supports. The storage days cannot exceed the design requirements to reduce the deformation of the steel casings caused by long-term storage.

[0145] In this embodiment, the specific method of installing the guide frame in step 2.1 is:

[0146] 2.1.1: Install the guide frame: First, place the guide frame in the predetermined position to ensure that the position of the guide frame is accurate. The installation of the guide frame should meet the design requirements to ensure that it is stable and reliable;

[0147] 2.1.2: Fixing the guide frame: After installing the guide frame, it needs to be fixed. The guide frame is firmly fixed to the steel trestle by welding to ensure that it will not loosen or shift during the subsequent construction process;

[0148] 2.1.3: Fixing the guide frame: After installing the guide frame, it needs to be fixed. The guide frame is firmly fixed to the steel trestle by welding to ensure that it will not loosen or shift during the subsequent construction process;

[0149] 2.1.4: Install the adjustment device: According to the design requirements, it is necessary to install the adjustment device on the guide frame so as to adjust and control the position of the steel casing in the subsequent construction;

[0150] 2.1.5: Acceptance: After the guide frame is installed, acceptance work is required to ensure that the installation of the guide frame complies with relevant technical standards and design requirements and to ensure its quality and stability.

[0151] The use of a double-layer steel casing lowering and centering positioning guide frame can effectively ensure the verticality of the steel casing during the lowering and installation process. It is also one of the measures to solve the problem of easy deviation of steel casing during lowering in inclined rock sections.

[0152] In this embodiment, the specific method of lowering the steel casing in step 2.1 is:

[0153] 1. The steel casing is lowered by a crawler crane. First, four lifting ports of the same elevation are opened at the top of the steel casing, and then a shoulder pole beam is used for lifting;

[0154] During the process of lowering the steel casing, a person is arranged on each side to monitor its verticality in real time using a plumb line, and a person is assigned to direct the crane for coordination. The docking between the steel casings adopts a large-diameter pile foundation steel casing docking positioning device, which only uses L-shaped steel and conical steel. One end of the L-shaped steel is welded and fixed to the top of the steel casing. After the lowering of the next section of the steel casing, the conical steel is inserted into the mouth of the L-shaped steel, and the conical steel is manually tapped until the steel casing is docked and positioned smoothly. The docking positioning device of the device is simple and has high efficiency in adjusting the docking steel casing, good verticality, simple production, convenient operation, low cost, recyclable, and easy to promote and use.

[0155] After all the above work is completed, report to the on-site supervision engineer for acceptance of the steel casing. After passing the acceptance, proceed to the next construction process.

[0156] Quality control of the lowering process: During the actual lowering process, it is necessary to strictly follow the design requirements and process procedures, including the control of lowering speed, lowering force, positioning accuracy, etc.

[0157] 2. After the steel casing is implanted and positioned, immediately weld the corbels on the steel casing to fix it, then assemble and weld the next section of the steel casing, and measure and check the verticality.

[0158] After the steel casing is buried, the plane position of the steel casing is checked using the lead point, and the lead point is corrected with a total station. After the inspection is correct, the center line of the pile foundation is re-measured and the cross line is marked with paint on the top of the steel casing to facilitate the next step of construction. The elevation point is marked at the designated position of the steel casing and used as the basis for the construction of this pile foundation. Measurement and recording: During the lowering process, the lowering position, height, levelness, etc. need to be monitored and recorded in real time to ensure the accuracy and stability of the lowering.

[0159] Quality control before lowering: Before lowering, the lowering equipment, lifting equipment and related measuring equipment should be inspected and confirmed to ensure the normal operation and accuracy of the equipment.

[0160] Adjustment and correction: If position deviation or other quality problems are found during the lowering process, adjustments and corrections must be made in a timely manner and recorded.

[0161] Final acceptance: After the lowering is completed, the position and verticality of the lowering need to be finally inspected and measured to ensure that they meet the design requirements and specification requirements. The quality data of the entire lowering process needs to be recorded and archived as a proof and traceability basis for construction quality.

[0162] In this embodiment, the specific method of laying the steel casing in step 3 is as follows:

[0163] 1. Set up monitoring points in two mutually perpendicular directions, direct the crane to operate, make the steel casing naturally vertically aligned with the pile position, start the vibrator; at the same time, slightly relax the crane hook, and control the hook's descending speed so that the casing can be sunk into the soil while maintaining a vertical state. Continuously observe the verticality of the steel casing at two observation points, and immediately adjust the hook position to correct any tilting tendency.

[0164] 2. Crawler crane cooperates with vibratory hammer to sink steel casing. When vibratory hammer vibrates into steel casing, it first uses deadweight to sink. After ensuring the accurate position of steel casing and sufficient stability of pile body, it uses vibration to sink.

[0165] 3. During the vibration process, the vibrating hammer, pile clamp, etc. must be reliably connected, and their center should be kept in a straight line with the center of the casing and the center of the bored pile as much as possible.

[0166] 4. After the casing is planted, it is necessary to carefully and accurately measure the casing and make detailed adjustments based on the measurement results. During the measurement, points can be set on the platform at the same time to facilitate the measurement of intersections. The position and elevation of the casing can be controlled by measurement during the insertion process.

[0167] In this embodiment, the specific method of the construction preparation in step 2.1 is:

[0168] 1. Before starting construction, review the construction drawings based on the engineering geological data and hydrogeological data provided by the design drilling, and then conduct detailed safety and technical briefings for on-site management personnel and construction personnel.

[0169] 2. Investigate the construction site environment and the natural environment, underwater conditions, dangerous buildings, etc. in the adjacent areas.

[0170] 3. Check and verify the technical performance and related information of the main construction machinery and its supporting equipment to ensure safety and continuity during the construction process.

[0171] 4. Arrange the construction site reasonably according to the design drawings, do a good job of pile foundation hole protection and remove debris. After site preparation, organize surveying and setting out personnel to lay out all pile positions, nail cross protection piles, do a good job of measurement review, and record the setting out data for filing.

[0172] In this embodiment, the specific method of processing the steel casing in the inclined rock section in step 1.2 is:

[0173] In order to solve the problem of easy displacement and slippage of steel casing in inclined rock sections, customized steel casing with the same slope as the riverbed is adopted. According to geological exploration and design drawings, the slope of the riverbed at the pile foundation position is determined, and then the steel casing is cut with inscribed lines to ensure that the bottom slope of the steel casing is consistent with the slope of the riverbed.

[0174] It should be noted that the control method of the present application can be automatically controlled by a controller, and the control method of the controller can be implemented by simple programming by technicians in this field, which is common knowledge in this field, and the present application is mainly used to protect mechanical structures, so the present application will no longer explain the control method and circuit connection in detail.

[0175] In summary, the large-diameter pile foundation steel casing installation construction method for the inclined rock section of the deep-water reservoir area of ​​the embodiment of the present application, in the steel casing processing stage, firstly, a plasma cutting machine is used to bevel the steel plate, and a plate rolling machine is used to roll the steel plate for the first time, and then the second steel casing is docked, the seam is spot welded and fixed, and then a second rounding is performed to ensure that the steel casing is round before the bevel is fully welded, wherein the first section of the steel casing needs to be equipped with a reinforcing hoop, and a 30cn width steel plate is rolled into a circle and then welded and fixed to the bottom of the steel casing. In the steel casing lowering stage, the lowering and centering positioning guide frame of the double-layer steel casing is first measured and laid out to determine the center line of the guide frame and the pile foundation hole. In the process of lowering and assembling the steel casing, an innovatively developed large-diameter pile foundation steel casing docking and positioning device is used to adjust and center the steel casing, and full welding is performed after centering. Finally, the steel casing is assembled, fully welded, and lowered in sequence until it is lowered to the predetermined position. During the steel casing installation stage, a pile driver is used to drive the steel casing into the foundation along the depth and direction required by the design to ensure the verticality and positioning accuracy of the installation.

[0176] This application adopts the technical solution of "Patent No.: ZL 202320282487.1, Name: A large-diameter pile foundation steel casing docking positioning device" in construction;

[0177] The technical solution of "Patent No.: ZL 202320311148.1, Name: An automatic telescopic guide frame for lowering large-diameter pile foundation steel casing" is adopted.

[0178] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0179] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0180] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and deform the above embodiments within the scope of the present application.

Claims

1. A method for installing a large-diameter pile foundation steel casing in a deep-water reservoir area in an inclined rock section, characterized in that it comprises the following steps: Step 1: Steel casing processing stage; 1. Inspection and acceptance of steel casing steel plates; 2. Use plasma cutting technology to bevel the steel casing and process the steel casing in the inclined rock section; 3. Use a plate rolling machine to roll the steel plate for the first time, then connect it to the second steel casing and fix the seam by spot welding; 4. Use a plate rolling machine to roll the steel plate twice, add a reinforcing hoop to the first section of the steel casing to ensure that the steel casing is round before fully welding the groove; 5. Assemble the steel casing to form a group of steel casings and set up internal supports for storage. Step 2: Steel casing lowering stage.

1. Construction preparation: measurement and layout of the lowering and centering guide frame of the double-layer steel casing; 2. Make sure the center line of the guide frame is aligned with the hole of the pile foundation, and install the double-layer centering positioning guide frame; 3. Lower the first set of steel casing; 4. The second set of steel casing at the bottom; 5. During the assembly of the steel casing, an innovatively developed large-diameter pile foundation steel casing docking and positioning device is used to adjust and center the steel casing, and full welding is performed after centering; 6. Finally, assemble, fully weld and lower the steel casing in sequence until it is lowered to the predetermined position. Step 3: Steel casing installation stage; A pile driver is used to drive the steel casing into the foundation along the depth and direction required by the design, ensuring the verticality and positioning accuracy of the pile.

2. The method for installing a large-diameter pile foundation steel casing in a deep-water reservoir inclined rock section according to claim 1 is characterized in that: The specific method of inspection and acceptance of the steel casing steel plate in step 1.1 is: 1.1.1: Appearance inspection: Perform appearance inspection on the surface of the steel plate, including checking whether there are obvious cracks, dents, oxidation and other defects, and whether the surface is flat and clean. 1.1.2: Dimension inspection: Measure the thickness, length and width of the steel plate to ensure that it meets the design requirements. 1.1.3: Chemical composition analysis: Through sampling and analysis, the chemical composition of the steel plate, including the main alloy elements and impurity content, is tested to ensure that it meets the design standards. 1.1.4: Mechanical performance test: Conduct tensile test, impact test and other mechanical performance tests to verify whether the strength, toughness and other performance indicators of the steel plate meet the requirements. 1.1.5: Weld inspection: Perform flaw detection, ultrasonic or radiographic inspection on the welded parts to ensure that the weld quality meets the relevant standards. 1.1.6: Hardness test: Conduct hardness test on steel plate to verify whether its hardness meets the design requirements. 1.1.7: Acceptance documents: Check the relevant acceptance documents of steel casing steel plate, including factory certificate, warranty, etc., to ensure its compliance.

3. The method for installing and constructing a large-diameter pile foundation steel casing in an inclined rock section of a deep-water reservoir according to claim 1, characterized in that the specific method for beveling the steel plate in step 1.2 is: 1.2.1: Determine the opening location and size, and clean the opening area to ensure the surface is clean. 1.2.2: Measurement and marking: According to the design requirements, measure and mark the end of the steel casing to determine the position, length and angle of the groove. 1.2.3: Cutting: Use appropriate cutting equipment (such as oxyacetylene cutting, plasma cutting, etc.) to cut the end of the steel casing according to the marking to form the required groove shape. 1.2.4: Bevel shaping: According to the design requirements, the bevel after cutting shall be shaped and trimmed to ensure that the surface of the bevel is smooth without cracks or other defects. 1.2.5: Acceptance: Acceptance of the steel casing after beveling to ensure that the beveling processing meets the design requirements and relevant standards.

4. The method for installing and constructing a large-diameter pile foundation steel casing in an inclined rock section of a deep-water reservoir according to claim 1, characterized in that the specific method of rounding the steel plate in steps 1.3 and 1.4 is: Initial rolling: 1.3.1: Place the steel plate on the rounding machine and use the rounding machine to round the steel plate according to the parameter settings to form the required round shape. 1.3.2: Rolling adjustment: Adjust the rolled steel casing according to the actual situation to ensure that its roundness and size meet the design requirements; 1.3.3: Rolling adjustment: Adjust the rolled steel casing according to the actual situation to ensure that its roundness and size meet the design requirements; 1.3.4: Joint treatment: The steel casing after rounding is welded by using carbon dioxide gas shielded welding to make the steel casing form a whole; Secondary rolling: 1.4.1: After the seam welding is completed, the rounding machine is used for secondary rounding to reduce the thermal deformation of the steel casing during the welding process, ensure the smoothness of the weld, and achieve the complete arc of the steel casing. 1.4.2: The first section of steel casing installation reinforcement hoop: In order to solve the problem of curling and deviation during the installation of steel casing in the inclined rock section, a 30cm reinforcement hoop is added to the bottom of the steel casing to enhance the strength of the steel casing at the contact surface between the steel casing and the riverbed. 1.4.3: Set up internal support: Use a M-shaped internal support system to provide fixed support inside the steel casing to prevent the steel casing from deformation during storage. 1.4.4: Acceptance: Acceptance of the steel casing after rounding shall be carried out to ensure that the rounding process meets the design requirements and relevant standards.

5. The method for installing and constructing a large-diameter pile foundation steel casing in an inclined rock section of a deep-water reservoir according to claim 1 is characterized in that: The specific method of assembling the steel casing in step 1.5 is as follows: Each set of steel casings is composed of 6 pieces of steel casings assembled and welded, and the length of a set of steel casings is 10.8m. After the steel casings are assembled and welded, they are hoisted and stored with internal supports. The storage days cannot exceed the design requirements to reduce the deformation of the steel casings caused by long-term storage.

6. The method for installing a large-diameter pile foundation steel casing in a deep-water reservoir inclined rock section according to claim 1 is characterized in that: The specific method of installing the guide frame in step 2.1 is: 2.1.1: Install the guide frame: First, place the guide frame in the predetermined position to ensure that the position of the guide frame is accurate. The installation of the guide frame should meet the design requirements to ensure that it is stable and reliable; 2.1.2: Fixing the guide frame: After installing the guide frame, it needs to be fixed. The guide frame is firmly fixed to the steel trestle by welding to ensure that it will not loosen or shift during the subsequent construction process; 2.1.3: Fixing the guide frame: After installing the guide frame, it needs to be fixed. The guide frame is firmly fixed to the steel trestle by welding to ensure that it will not loosen or shift during the subsequent construction process; 2.1.4: Install the adjustment device: According to the design requirements, it is necessary to install the adjustment device on the guide frame so as to adjust and control the position of the steel casing in the subsequent construction; 2.1.5: Acceptance: After the guide frame is installed, acceptance work is required to ensure that the installation of the guide frame complies with relevant technical standards and design requirements and to ensure its quality and stability.

7. The method for installing a large-diameter pile foundation steel casing in a deep-water reservoir inclined rock section according to claim 1 is characterized in that: The specific method of lowering the steel casing in step 2.1 is:

1. The steel casing is lowered by a crawler crane. First, four lifting ports of the same elevation are opened at the top of the steel casing, and then a shoulder pole beam is used for lifting; 2. After the steel casing is implanted and positioned, immediately weld the corbels on the steel casing to fix it, then assemble and weld the next section of the steel casing, and measure and check the verticality.

8. The method for installing a large-diameter pile foundation steel casing in a deep-water reservoir inclined rock section according to claim 1 is characterized in that: The specific method of laying the steel casing in step 3 is as follows:

1. Set up monitoring points in two mutually perpendicular directions, direct the crane to operate, make the steel casing naturally vertically aligned with the pile position, start the vibrator; at the same time, slightly relax the crane hook, and control the hook's descending speed so that the casing can be sunk into the soil while maintaining a vertical state. Continuously observe the verticality of the steel casing at two observation points, and immediately adjust the hook position to correct any tilting tendency.

2. Crawler crane cooperates with vibratory hammer to sink steel casing. When vibratory hammer vibrates into steel casing, it first uses deadweight to sink. After ensuring the accurate position of steel casing and sufficient stability of pile body, it uses vibration to sink.

3. During the vibration process, the vibrating hammer, pile clamp, etc. must be reliably connected, and their center should be kept in a straight line with the center of the casing and the center of the bored pile as much as possible.

4. After the casing is planted, it is necessary to carefully and accurately measure the casing and make detailed adjustments based on the measurement results. During the measurement, points can be set on the platform at the same time to facilitate the measurement of intersections. The position and elevation of the casing can be controlled by measurement during the insertion process.

9. The method for installing a large-diameter pile foundation steel casing in a deep-water reservoir inclined rock section according to claim 1 is characterized in that: The specific method of construction preparation in step 2.1 is as follows:

1. Before starting construction, review the construction drawings based on the engineering geological data and hydrogeological data provided by the design drilling, and then conduct detailed safety and technical briefings for on-site management personnel and construction personnel.

2. Investigate the construction site environment and the natural environment, underwater conditions, dangerous buildings, etc. in the adjacent areas.

3. Check and verify the technical performance and related information of the main construction machinery and its supporting equipment to ensure safety and continuity during the construction process.

4. Arrange the construction site reasonably according to the design drawings, do a good job of pile foundation hole protection and remove debris. After site preparation, organize surveying and setting out personnel to lay out all pile positions, nail cross protection piles, do a good job of measurement review, and record the setting out data for filing.

10. The method for installing a large-diameter pile foundation steel casing in a deep-water reservoir inclined rock section according to claim 1, characterized in that: The specific method of processing the steel casing in the inclined rock section in step 1.2 is as follows: In order to solve the problem of easy displacement and slippage of steel casing in inclined rock sections, customized steel casing with the same slope as the riverbed is adopted. According to geological exploration and design drawings, the slope of the riverbed at the pile foundation position is determined, and then the steel casing is cut with inscribed lines to ensure that the bottom slope of the steel casing is consistent with the slope of the riverbed.

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